Q.

In a photocell light energy is converted into –

A. Potential energy
B. Chemical energy
C. Heat energy
D. Electrical energy
Answer» D. Electrical energy
Explanation: Photocells are scientifically known as photo-resistors. A photo-resistor or light dependent resistor (LDR) is a resistor whose resistance decreases with increasing incident light intensity; in other words, it exhibits photoconductivity. A photo-resistor is made of a high resistance semiconductor. If light falling on the device is of high enough frequency, photons absorbed by the semiconductor give bound electrons enough energy to jump into the conduction band.
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